Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 432 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 795 + 428 = 1223. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 353 + 655 = 1004. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 124 + 344 = 468. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 70 × 45 = 3150. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 96 × 44 = 4224. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 77 × 46 = 3542. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 43 × 46 = 1978. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 93 × 63 = 5859. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 14 × 33 = 462. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 379 + 253 = 632. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 71 × 28 = 1991. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 293 + 493 = 786. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 27 × 27 = 727. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 777 + 650 = 1431. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 28 × 50 = 1400. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 626 + 251 = 877. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 98 × 71 = 6958. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 32 × 90 = 2876. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 24 × 41 = 986. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 948 + 226 = 1174. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 669 + 531 = 1200. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 473 + 469 = 942. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 54 × 73 = 3942. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 16 × 92 = 1480. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 41 × 54 = 2214. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 44 × 87 = 3828. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 92 × 29 = 2668. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 903 + 777 = 1675. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 36 × 30 = 1080. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 88 × 12 = 1063. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 53 × 75 = 3968. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 960 + 425 = 1377. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 19 × 16 = 304. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 459 + 370 = 829. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 299 + 354 = 653. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 328 + 680 = 1008. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 970 + 246 = 1216. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 89 × 45 = 3999. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 26 × 19 = 494. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 66 × 56 = 3693. Correct or wrong? (a) wrong (b) correct

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